CN108809099A - Flyback type electric source supply circuit and its primary side control circuit and method - Google Patents
Flyback type electric source supply circuit and its primary side control circuit and method Download PDFInfo
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- CN108809099A CN108809099A CN201710929683.2A CN201710929683A CN108809099A CN 108809099 A CN108809099 A CN 108809099A CN 201710929683 A CN201710929683 A CN 201710929683A CN 108809099 A CN108809099 A CN 108809099A
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- output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
A kind of flyback type electric source supply circuit and its primary side control circuit and method.The flyback type electric source supply circuit, including transformer, power switch, primary side control circuit and secondary side control circuit.Transformer converts input voltage and generates first, second and third output voltage.Primary side control circuit and secondary side control circuit respectively using the second output voltage with and third output voltage associated voltage as power supply.In Cong Xun patterns, when the second output voltage is less than first threshold, triggering enters power supply shaping modes, to control power switch, so that the second output voltage stops power supply shaping modes and enters a reset routine between the first threshold and a second threshold, and in entering power supply shaping modes after the delay periods of an acquiescence, wherein power switch control is is not turned on so that third output voltage less than secondary side restart threshold value thus restart secondary side control circuit.
Description
Technical field
The present invention relates to a kind of flyback type electric source supply circuits, particularly relate to a kind of flyback with power supply shaping modes
Power supply circuit.The invention further relates to for the primary side control circuit and method in flyback type electric source supply circuit.
Background technology
Fig. 1 shows a kind of flyback type electric source supply circuit of the prior art (flyback type electric source supply circuit 1), wherein flyback
Formula power supply circuit 1 includes transformer 10, power switch N1, primary side control circuit 30 and secondary side control circuit 20.
The operation waveform schematic diagram corresponding to Fig. 1 is shown please refer to Fig. 2, Fig. 2, and flyback type electric source supply circuit 1 is in a Cong Xun moulds
In formula (burst mode), when output voltage VDD1 (to power supply as primary side control circuit 30) is less than first voltage threshold
When value VTH1, the triggering of primary side control circuit 30 enters a power supply shaping modes, to control the second output voltage VDD1 between the
Between one voltage threshold VTH1 and second voltage threshold value VTH2.
Fig. 1 and the prior art shown in Fig. 2, its shortcoming is that, since above-mentioned power supply shaping modes can be constant,
Therefore, when the triggering of secondary side control circuit 20 is such as, but not limited to protected mode, and secondary side control circuit 20 to be made is restarted,
It can be because VDD1 by being controlled in above-mentioned power supply shaping modes, and can not drag down feedback compensation letter by controlling coupling element 40
Number COMP and the switching for stopping power switch N1, thus VDD2 may stop (to the power supply as secondary side control circuit 20)
Staying in voltage level VHP as shown in Figure 2, (could possibly be higher than secondary side control circuit 20 in some cases restarts voltage threshold
Value VPR2) so that secondary side control circuit 20 can not restart, and above-mentioned situation may especially betide certain output voltage VO UT
Level, therefore (the such as, but not limited to voltage of VBUS of USB PD specifications) especially in the case of output voltage VO UT is variable
It is easy to meet with above-mentioned problem.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose a kind of flyback type electric source supply circuit and
Its primary side control circuit and method can ensure that restarting for secondary side control circuit 20.
In order to achieve the above-mentioned object of the invention, one of viewpoint is sayed that the present invention provides a kind of flyback type electric source supplies
Circuit, including：One transformer has first side winding, to receive an input voltage；Secondary side winding, to generate the first output
Voltage；And a tertiary winding, to generate the second output voltage；One secondary side control circuit is located at the secondary side of the transformer,
Using a third output voltage as power supply, to control a coupling element according to first output voltage, and in the transformer
Primary side generates a feedback compensation signal, and the wherein third output voltage is relevant to first output voltage；One power switch, coupling
It is connected to the first side winding；And a primary side control circuit, it is located at the primary side of the transformer, is with second output voltage
Power supply to generate a switch control signal to control the power switch, and controls the conducting state of the first side winding, wherein
The coupling element is coupled between the primary side control circuit and the secondary side control circuit, which includes：
One voltage sensing circuit, to be generated with a first voltage threshold value and a second voltage threshold value according to second output voltage
One compares output signal；One logic processing circuit is coupled to the voltage sensing circuit, to generate the switch control signal；With
And a timing circuit, it is coupled to the voltage sensing circuit and the logic processing circuit, to generate a timing signal；Wherein should
Logic processing circuit is in a Cong Xun patterns (burst mode), according to the comparison output signal, when second output voltage is low
When the first voltage threshold value, triggering enters a power supply shaping modes, to control the power switch so that second output voltage
Between the first voltage threshold value and a second voltage threshold value, and the logic processing circuit is according to the timing signal, in entrance
The power supply shaping modes rise one acquiescence delay periods after, stop the power supply shaping modes so that the primary side control circuit into
Enter a reset routine, wherein in the reset routine, it is to be not turned on to control the power switch so that the third output voltage is less than
One secondary side restarts threshold value thus restarts the secondary side control circuit.
In a preferred embodiment, in the reset routine, it is to be not turned on more to control the power switch so that this is second defeated
Go out that voltage is primary less than one to be stressed to open threshold value thus restart the primary side control circuit.
In a preferred embodiment, the primary side control circuit according to the feedback compensation signal and a tertiary voltage threshold value and
Determine the Cong Xun patterns.
In a preferred embodiment, the secondary side control circuit controls the coupling element to adjust in a protected mode
The feedback compensation signal is to a compliance voltage level so that it is to be not turned on, and then make that the switch control signal, which controls the power switch,
Primary side control circuit triggering enters the power supply shaping modes, and enters the reset routine in turn.
In a preferred embodiment, which controls a leadage circuit in a protected mode, should
First output voltage discharges so that the third output voltage restarts threshold value less than the secondary side.
In a preferred embodiment, which is a variable value.
In a preferred embodiment, which determines first output voltage according to an adjustment signal
Level.
Another viewpoint is sayed, the present invention also provides a kind of primary side control circuits, for controlling a flyback power supply
Supply circuit, wherein the flyback type electric source supply circuit include：One transformer has first side winding, to receive an input electricity
Pressure；Secondary side winding, to generate the first output voltage；And a tertiary winding, to generate the second output voltage；One secondary side control
Circuit processed is located at the secondary side of the transformer, using a third output voltage as power supply, to be controlled according to first output voltage
A coupling element is made, and a feedback compensation signal is generated in the primary side of the transformer, the wherein third output voltage is relevant to
First output voltage；And a power switch, it is coupled to the first side winding；Wherein the primary side control circuit is located at the change
The primary side of depressor, using second output voltage as power supply, to generate a switch control signal to control the power switch, and
The conducting state of the first side winding is controlled, wherein the coupling element is coupled to the primary side control circuit and is controlled with the secondary side
Between circuit；The primary side control circuit includes：One voltage sensing circuit, to according to second output voltage and one first electricity
It presses threshold value and a second voltage threshold value and generates one and compare output signal；One logic processing circuit is coupled to the voltage sensing
Circuit, to generate the switch control signal；And a timing circuit, it is coupled to the voltage sensing circuit and the logical process
Circuit, to generate a timing signal；Wherein the logic processing circuit is in a Cong Xun patterns (burst mode), according to the ratio
Compared with output signal, when second output voltage is less than the first voltage threshold value, triggering enters a power supply shaping modes, with control
The power switch so that second output voltage is between the first voltage threshold value and a second voltage threshold value, and the logic
Processing circuit stops the power supply tune according to the timing signal in entering the power supply shaping modes after the delay periods of an acquiescence
Section pattern so that the primary side control circuit enters a reset routine, wherein in the reset routine, controlling the power switch is
It is not turned on so that the third output voltage restarts threshold value less than a secondary side thus restarts the secondary side control circuit.
Another viewpoint is sayed, the present invention also provides a kind of method for controlling a flyback type electric source supply circuit,
Wherein the flyback type electric source supply circuit includes：One transformer has first side winding, to receive an input voltage；Secondary side
Winding, to generate the first output voltage；And a tertiary winding, to generate the second output voltage；One secondary side control circuit, position
In the secondary side of the transformer, using a third output voltage as power supply, to control a coupling according to first output voltage
Element, and a feedback compensation signal is generated in the primary side of the transformer, it is first defeated to be relevant to this for the wherein third output voltage
Go out voltage；One power switch is coupled to the first side winding；And a primary side control circuit, it is located at the primary of the transformer
Side, using second output voltage as power supply, to generate a switch control signal to control the power switch, the wherein coupling is first
Part is coupled between the primary side control circuit and the secondary side control circuit；The method includes the steps of：Yu Yicong interrogates mould
In formula (burst mode), when second output voltage is less than a first voltage threshold value, triggering enters a power supply shaping modes,
To control the power switch so that second output voltage is between the first voltage threshold value and a second voltage threshold value；In
After the delay periods for playing an acquiescence into the power supply shaping modes, stop the power supply shaping modes so that primary side control electricity
Road enters a reset routine；And wherein in the reset routine, it is to be not turned on to control the power switch so that the third exports
Voltage restarts threshold value less than a secondary side thus restarts the secondary side control circuit.
In a preferred embodiment, this method also comprises the steps of：In the reset routine, controlling the power switch is
It is not turned on so that second output voltage is primary less than one to be stressed to open threshold value thus restart the primary side control circuit.
In a preferred embodiment, this method also comprises the steps of：According to the feedback compensation signal and a tertiary voltage
Threshold value and determine the Cong Xun patterns.
In a preferred embodiment, it triggers into the step of power supply shaping modes and further includes：In a protected mode, control
The coupling element is made to adjust the feedback compensation signal to a compliance voltage level so that the switch control signal controls the power and opens
It closes to be not turned on, and then primary side control circuit triggering is made to enter the power supply shaping modes, and enter the reset routine in turn.
In a preferred embodiment, this method also comprises the steps of：In a protected mode, by first output voltage
Electric discharge so that the third output voltage restarts threshold value less than the secondary side.
Below by way of specific embodiment elaborate, should be easier to understand the purpose of the present invention, technology contents, feature and
The effect of it is realized.
Description of the drawings
Fig. 1 shows a kind of schematic diagram of prior art flyback type electric source supply circuit；
Fig. 2 shows the waveform diagram of 1 prior art of corresponding diagram；
The schematic diagram of one embodiment of the flyback type electric source supply circuit of Fig. 3 display present invention；
Fig. 4 shows the waveform diagram of 3 embodiment of corresponding diagram；
The schematic diagram of one embodiment of the flyback type electric source supply circuit of Fig. 5 display present invention；
In the flyback type electric source supply circuit of Fig. 6 display present invention, the schematic diagram of an embodiment of primary side control circuit；
Fig. 7 shows the waveform diagram of 5 embodiment of corresponding diagram；
In the flyback type electric source supply circuit of Fig. 8 display present invention, the schematic diagram of an embodiment of logic processing circuit；
In the flyback type electric source supply circuit of Fig. 9 display present invention, the schematic diagram of an embodiment of secondary side control circuit.
Symbol description in figure
1,3,5 flyback type electric source supply circuit
10 transformers
20 secondary side control circuits
21 leadage circuits
22 feedback control circuits
23 generating circuit from reference voltage
30,30 ' primary side control circuits
31 voltage sensing circuits
32 logic processing circuits
321,322,323 latch circuits
33 timing circuits
331 counters
34 Cong Xun pattern decision circuits
341,342 comparison circuits
40 coupling elements
41,42 coupling parts
CC adjusts signal
COMP feedback compensation signals
CPO, CPP, CPO1, CPO2 compare output signal
CPP1, CPP2 compare output signal
FB feedback signals
GATE switch control signals
ILD load currents
N ratios of winding
N1 power switch
PWM modulated signals
TC timing control signals
Td delay periods
TS timing signals
VDD1, VDD2 output voltage
VIN input voltages
VOUT output voltages
VPR power initiation voltage thresholds
VPR1, VPR2 restart voltage threshold
VREF reference voltages
VTH1, VTH2 voltage threshold
VTH3, VTH4 voltage threshold
VTR1 activation threshold values
VTR2 Cong Xun mode thresholds
W2 secondary side windings
W1 first side windings
The W3 tertiary windings
Specific implementation mode
Attached drawing in the present invention belongs to signal, the coupling relationship and each signal waveform for being mostly intended to indicate between each circuit
Between relationship, as circuit, signal waveform and frequency then and not according to ratio draw.
Referring to Fig. 3, a kind of embodiment (flyback power supply of the flyback type electric source supply circuit as shown in the figure for the present invention
Supply circuit 3), flyback type electric source supply circuit 3 includes transformer 10, power switch N1, primary side control circuit 30 and two
Secondary side control circuit 20.Transformer 10 has first side winding W1, secondary side winding W2 and tertiary winding W3, wherein once
Side winding W1 is to receive an input voltage VIN, and secondary side winding W2 is to generate the first output voltage VO UT, and the tertiary winding
W3 is then generating the second output voltage VDD1.Power switch N1 is coupled to first side winding W1.Primary side control circuit 30
In the primary side of transformer 10, using the second output voltage VDD1 as power supply, to generate switch control signal GATE to control work(
Rate switch N1, and the conducting state of first side winding W1 is controlled, in one embodiment, primary side control circuit 30 is for example but unlimited
It generates switch control signal GATE in carrying out such as PWM modulation systems according to feedback compensation signal COMP and is opened with controlling power
Close N1.Secondary side control circuit 20 is located at the secondary side of transformer 10, using third output voltage VDD2 as power supply, to according to
One output voltage VO UT and control coupling element 40 (such as, but not limited to optical coupling element, including the first coupling part 41 and second
Coupling part 42), and feedback compensation signal COMP is generated in primary side, wherein coupling element 40 is coupled to primary side control circuit
Between (passing through the first coupling part 41) and secondary side control circuit (by the second coupling part 42).Wherein third output voltage VDD2
It is relevant to the first output voltage VO UT, in one embodiment, third output voltage VDD2 is coupled directly to the first output voltage
VOUT, in other embodiments, third output voltage VDD2 can be after the first output voltage VO UT is for example divided, filters or adjusted
Output.In one embodiment, in secondary side, the second coupling part 42 can be coupled to a feedback signal FB, and pass through the first coupling
Conjunction portion 41 and generate feedback compensation signal COMP, in one embodiment, can pass through this backfeed loop adjust the first output voltage
VOUT is to a target voltage values, wherein feedback signal FB is relevant to the first output voltage VO UT, may be, for example, VOUT itself or
It is divided.In addition, as the compensation way of the feedback signal FB in figure is only for example and unrestricted.
Please continue to refer to Fig. 3, in one embodiment, primary side control circuit 30 includes a voltage sensing circuit 31, and one patrols
Collect processing circuit 32 and a timing circuit 33.Voltage sensing circuit 31 is to according to the second output voltage VDD1 and first voltage
Threshold value VTH1 and second voltage threshold value VTH2 and generate and compare output signal CPO；Logic processing circuit 32 is coupled to voltage sense
Slowdown monitoring circuit 31, to generate switch control signal GATE；Timing circuit 33 is coupled to voltage sensing circuit 31 and logical process
Circuit 32, to generate a timing signal TS.The operation waveform schematic diagram corresponding to Fig. 3 is shown please refer to Fig. 4, Fig. 4,
In the logic processing circuit 32 in a Cong Xun patterns (burst mode), according to comparing output signal CPO, when the second output electricity
When VDD1 being pressed to be less than activation threshold value VTR1, triggering enters a power supply shaping modes, to control power switch N1 so that the second output
Voltage VDD1 is between first voltage threshold value VTH1 and second voltage threshold value VTH2, in one embodiment, firing level above-mentioned
Value VTR1 and first voltage threshold value VTH1 or second voltage threshold value VTH2 level having the same, in the present embodiment, activation threshold value
VTR1 and first voltage threshold value VTH1 level having the same；In one embodiment, first voltage threshold value VTH1 is less than the second electricity
Press threshold value VTH2.Then, logic processing circuit 32 is according to timing signal TS, the delay of an acquiescence in entering power supply shaping modes
After period (such as Td shown in Fig. 4), stop power supply shaping modes so that primary side control circuit 30 enters reset routine.?
In one embodiment, preset delay periods Td can be period or a period with relative length with absolute time, example
Delay periods Td is such as generated according to switch control signal GATE.
Please continue to refer to Fig. 3 and Fig. 4, in one embodiment, in reset routine, control power switch N1 is to be not turned on,
So that the second output voltage VDD1, which can decrease below primary side, restarts threshold value VPR1, and enable 30 weight of primary side control circuit
It opens.According to the present invention, since primary side control circuit 30 can stop operation in power supply shaping modes, the second output voltage
VDD1 is minimized, and therefore, third output voltage VDD2 can also decrease below secondary side and restart threshold value VPR2, and make secondary
Side control circuit 20 can also restart.It should be noted that the time point that secondary side is restarted can be identical to, later or earlier than once stressing
The time point opened.
" Cong Xun patterns " above-mentioned refers to, is the case where pole is lightly loaded in such as, but not limited to load current, or pass through tune
The mode of whole feedback compensation signal COMP level so that power switch N1 maintains to be not turned in a relatively long period.One
In embodiment, under " Cong Xun patterns ", power switch N1 maintains the period being not turned on to may include under several normal operatings (as loaded
Electric current is slightly higher) PWM cycle；Since the power supply (i.e. the second output voltage VDD1) of primary side control circuit 30 is also controlled in work(
The switching of rate switch N1, therefore in " Cong Xun patterns ", the time that power switch N1 is not turned on may be grown to being sufficient to make second
Output voltage VDD1 declines to a great extent to less than activation threshold value VTR1 and triggers into power supply shaping modes.
In one embodiment, primary side control circuit can according to feedback compensation signal COMP and Cong Xun mode thresholds VTR2 and
It generates one and compares output signal CPP to determine Cong Xun patterns.A kind of reality of the flyback type electric source supply circuit of Fig. 5 display present invention
Example (flyback type electric source supply circuit 5) is applied, flyback type electric source supply circuit 5 is similar with flyback type electric source supply circuit 3, wherein one
Secondary side control circuit 30 ' further includes a Cong Xun pattern decision circuits 34, is coupled to logic processing circuit 32, and is electrically connected to feedback
Thermal compensation signal COMP, wherein logic processing circuit 32 are according to output signal CPP is compared, when feedback compensation signal COMP is less than Cong Xun
When mode threshold VTR2, triggering enters Cong Xun patterns.Please refer to Fig. 4, in one embodiment, secondary side control circuit 20 in
In one protected mode, control coupling element 40 is to adjust feedback compensation signal COMP to a compliance voltage level, to trigger Cong Xun moulds
Formula, and make switch control signal GATE control power switch N1 be not turned on, and then make primary side control circuit 30 trigger into
Enter power supply shaping modes, and after the delay periods Td of acquiescence, and then enters reset routine.In one embodiment, control can be passed through
Coupling element 40 processed adjust feedback compensation signal COMP to an extreme value (such as, but not limited to as adjusted to earthing potential in Fig. 4, or
To be adjusted in other embodiment to supply voltage such as VDD1 etc.), and realize above-mentioned operation (namely trigger Cong Xun patterns,
And thus triggering power supply shaping modes and reset routine, and so that secondary side control circuit 20 is restarted in turn).
Referring to Fig. 7, Fig. 7 shows the operation waveform schematic diagram corresponding to Fig. 5, in the present embodiment, when load current ILD drops
It is low so that feedback compensation signal COMP is also decreased, when feedback compensation signal COMP decreases below Cong Xun mode thresholds
It when VTR2, triggers and enters Cong Xun patterns (Cong Xun patterns as shown in Figure 7), in the present embodiment, as shown, in Cong Xun patterns
In, control power switch N1 so that the level of feedback compensation signal COMP is between tertiary voltage threshold value VTH3 and the 4th voltage
Between threshold value VTH4 (whether such as, but not limited to by switch control signal GATE output pwm signals), in one embodiment, the
Three voltage threshold VTH3 and Cong Xun mode thresholds VTR2 above-mentioned level having the same.In the present embodiment, and work as load current
(such as Fig. 5 and load current ILD shown in Fig. 7) is further decreased so that the time that power switch N1 is not turned on may be grown to foot
So that the second output voltage VDD1 is decreased below activation threshold value VTR1 and triggers into power supply shaping modes (such as institute in Fig. 7
The power supply shaping modes shown).
Referring to Fig. 6, Fig. 6 shows a specific embodiment schematic diagram (primary side control circuit of primary side control circuit
30').In one embodiment, Cong Xun pattern decision circuits 34 include comparison circuit 341 and 342, to be respectively compared feedback compensation
Output signal CPP is (namely such as compared with signal COMP is generated with tertiary voltage threshold value VTH3 and the 4th voltage threshold VTH4
CPP1 and CPP2 shown in figure).In one embodiment, tertiary voltage threshold value VTH3 and Cong Xun mode thresholds VTR2 above-mentioned has
There is identical level.The waveform diagram corresponding to Fig. 6 is shown please refer to Fig. 7, Fig. 7.In one embodiment, primary side control
For circuit 30 ' processed in Cong Xun patterns, control power switch N1 makes feedback compensation signal COMP between tertiary voltage threshold value VTH3
And the 4th between voltage threshold VTH4.
Please continue to refer to Fig. 6, in one embodiment, voltage sensing circuit 31 includes comparison circuit 311 and 312, to divide
Do not compare and exports letter compared with the second output voltage VDD1 is generated with first voltage threshold value VTH1 and second voltage threshold value VTH2
Number CPO (namely as illustrated in the drawing CPO1 and CPO2).In one embodiment, timing circuit 33 includes counting as shown in the figure
Device 331, to generate timing letter with timing delays period Td according to switch control signal GATE and timing control signals TC
Number TS.In one embodiment, the timing basis of counter 331 can be other signals other than switch control signal GATE.
Referring to Fig. 8, a specific embodiment (logic processing circuit 32) schematic diagram of Fig. 8 display logics processing circuit 32.
In one embodiment, logic processing circuit 32 include an at least state control circuit (such as latch circuit shown in figure 321,
323) and combinational logic circuit (such as combinational logic gate shown in figure) 322 and, to according to relatively output letter above-mentioned
Number CPO1, CPO2, CPP1, CPP2, modulated signal PWM and timing signal TS, and generate switch control signal GATE and timing
Control signal TC.In one embodiment, modulated signal PWM is according to obtained by feedback compensation signal COMP.
Referring to Fig. 9, Fig. 9 shows a specific embodiment (the secondary side control circuit 20) signal of secondary side control circuit
Figure.In one embodiment, secondary side control circuit 20 controls a leadage circuit 21, and the first output voltage VO UT electric discharges make
It obtains third output voltage VDD2 and restarts threshold value less than a secondary side, secondary side control circuit 20 is enable to restart.Wherein vent discharge
Road 21 can be located at 20 inside of secondary side control circuit or outside.In one embodiment, as shown, secondary side control circuit 20
Including leadage circuit 21.And leadage circuit 21 is controlled in one embodiment can by the opportunity of the first output voltage VO UT electric discharge
It is carried out in a protected mode of secondary side control circuit 20, and in other embodiments, it also can be by other modes (such as but not
It is limited to by primary side control circuit 30) triggering.
In the flyback type electric source supply circuit of the present invention, the first output voltage VO UT can be fixed value or variable value.Please after
Continuous refering to Fig. 9, in one embodiment, secondary side control circuit 20 may include a feedback control circuit 22, to control coupling member
Part 40 (the second coupling part 42) in primary side by coupled modes to control feedback compensation signal COMP, in one embodiment, two
Secondary side control circuit 20 may include a generating circuit from reference voltage 23, to generate a reference voltage VREF, wherein feedback control
Circuit 22 generates primary side control feedback compensation signal COMP according to reference voltage VREF so that the first output voltage VO UT phases
About reference voltage VREF (such as, but not limited to output voltage VO UT is approximately equal to reference voltage VREF or its multiple).One
In embodiment, reference voltage VREF is variable, so that the first output voltage VO UT is also variable.In one embodiment, join
Examining voltage generation circuit 23, (the channel configuration in such as, but not limited to USB type C or USB PD is believed according to an adjustment signal CC
Number CC1 and CC2) and determine the level of the first output voltage VO UT.
Illustrate the present invention for preferred embodiment above, but described above, only those skilled in the art is made to be easy to
Understand present disclosure, interest field not for the purpose of limiting the invention.Illustrated each embodiment, however it is not limited to individually
Using can also combination application.In addition, under the same spirit of the present invention, it may occur to persons skilled in the art that various equivalent
Variation and various combinations for example " carry out processing or operation according to certain signal or generate certain output to tie alleged by the present invention
Fruit " is not limited to itself the signal be carried out Voltage to current transducer, Current Voltage turns also comprising when necessary according to the signal
Change and/or ratio conversion etc., later according to transformed signal carry out processing or operation generate certain output result.It follows that
Under the same spirit of the present invention, it may occur to persons skilled in the art that various equivalence changes and various combinations, a combination thereof side
Formula is a lot of, explanation numerous to list herein.Therefore, the scope of the present invention should cover above-mentioned and other all equivalence changes.
Claims (21)
1. a kind of flyback type electric source supply circuit, which is characterized in that include：
One transformer has first side winding, to receive an input voltage；Secondary side winding, to generate the first output voltage；With
And a tertiary winding, to generate the second output voltage；
One secondary side control circuit is located at the secondary side of the transformer, using a third output voltage as power supply, to according to this
One output voltage and control a coupling element, and generate a feedback compensation signal, the wherein third in the primary side of the transformer
Output voltage is relevant to first output voltage；
One power switch is coupled to the first side winding；And
One primary side control circuit, the primary side for being located at the transformer are opened using second output voltage as power supply to generate one
Control signal is closed to control the power switch, and controls the conducting state of the first side winding, wherein the coupling element is coupled to
Between the primary side control circuit and the secondary side control circuit, which includes：
One voltage sensing circuit, to according to second output voltage and a first voltage threshold value and a second voltage threshold value and
It generates one and compares output signal；
One logic processing circuit is coupled to the voltage sensing circuit, to generate the switch control signal；And
One timing circuit is coupled to the voltage sensing circuit and the logic processing circuit, to generate a timing signal；
The wherein logic processing circuit is in a Cong Xun patterns, according to the comparison output signal, when second output voltage is less than
When the first voltage threshold value, triggering enters a power supply shaping modes, to control the power switch so that second output voltage is situated between
Between the first voltage threshold value and a second voltage threshold value, and the logic processing circuit is somebody's turn to do according to the timing signal in entering
After power supply shaping modes play the delay periods of an acquiescence, stop the power supply shaping modes so that the primary side control circuit enters
One reset routine, wherein in the reset routine, it is to be not turned on to control the power switch so that the third output voltage is less than one
Secondary side restarts threshold value thus restarts the secondary side control circuit.
2. flyback type electric source supply circuit according to claim 1, wherein in the reset routine, more control the power
Switch is is not turned on so that second output voltage is primary less than one to be stressed to open threshold value thus restart the primary side control circuit.
3. flyback type electric source supply circuit according to claim 1, wherein the primary side control circuit is mended according to the feedback
It repays signal and a tertiary voltage threshold value and determines the Cong Xun patterns.
4. flyback type electric source supply circuit according to claim 1, wherein the secondary side control circuit protects mould in one
In formula, the coupling element is controlled to adjust the feedback compensation signal to a compliance voltage level so that the switch control signal controls
The power switch is to be not turned on, and then primary side control circuit triggering is made to enter the power supply shaping modes, and entering in turn should
Reset routine.
5. flyback type electric source supply circuit according to claim 1, wherein the secondary side control circuit is in a protected mode
One leadage circuit of middle control discharges first output voltage so that the third output voltage restarts threshold less than the secondary side
Value.
6. flyback type electric source supply circuit according to claim 1, wherein first output voltage is a variable value.
7. flyback type electric source supply circuit according to claim 6, wherein the secondary side control circuit is believed according to an adjustment
Number and determine the level of first output voltage.
8. a kind of primary side control circuit, which is characterized in that for controlling a flyback type electric source supply circuit, the wherein flyback
Power supply circuit includes：One transformer has first side winding, to receive an input voltage；Secondary side winding, to generate
One output voltage；And a tertiary winding, to generate the second output voltage；One secondary side control circuit is located at the transformer
Secondary side, using a third output voltage as power supply, to control a coupling element according to first output voltage, and in the change
The primary side of depressor generates a feedback compensation signal, and the wherein third output voltage is relevant to first output voltage；And one
Power switch is coupled to the first side winding；Wherein the primary side control circuit is located at the primary side of the transformer, with this second
Output voltage is power supply, to generate a switch control signal to control the power switch, and controls leading for the first side winding
Logical state, the wherein coupling element are coupled between the primary side control circuit and the secondary side control circuit；The primary side control
Circuit processed includes：
One voltage sensing circuit, to according to second output voltage and a first voltage threshold value and a second voltage threshold value and
It generates one and compares output signal；
One logic processing circuit is coupled to the voltage sensing circuit, to generate the switch control signal；And
One timing circuit is coupled to the voltage sensing circuit and the logic processing circuit, to generate a timing signal；
The wherein logic processing circuit is in a Cong Xun patterns, according to the comparison output signal, when second output voltage is less than
When the first voltage threshold value, triggering enters a power supply shaping modes, to control the power switch so that second output voltage is situated between
Between the first voltage threshold value and a second voltage threshold value, and the logic processing circuit is somebody's turn to do according to the timing signal in entering
After power supply shaping modes play the delay periods of an acquiescence, stop the power supply shaping modes so that the primary side control circuit enters
One reset routine, wherein in the reset routine, it is to be not turned on to control the power switch so that the third output voltage is less than one
Secondary side restarts threshold value thus restarts the secondary side control circuit.
9. primary side control circuit according to claim 8, wherein in the reset routine, more control the power switch
To be not turned on so that second output voltage is primary less than one to be stressed to open threshold value thus restart the primary side control circuit.
10. primary side control circuit according to claim 8, wherein the primary side control circuit is according to the feedback compensation
Signal and a tertiary voltage threshold value and determine the Cong Xun patterns.
11. primary side control circuit according to claim 8, wherein the secondary side control circuit, in a protected mode
In, the coupling element is controlled to adjust the feedback compensation signal to a compliance voltage level so that switch control signal control should
Power switch is to be not turned on, and then primary side control circuit triggering is made to enter the power supply shaping modes, and it is heavy to enter this in turn
It leaves sequence.
12. primary side control circuit according to claim 8, wherein the secondary side control circuit is in a protected mode
A leadage circuit is controlled, which is discharged so that the third output voltage restarts threshold value less than the secondary side.
13. primary side control circuit according to claim 8, wherein first output voltage is a variable value.
14. primary side control circuit according to claim 13, wherein the secondary side control circuit is according to an adjustment signal
And determine the level of first output voltage.
15. a kind of method for controlling a flyback type electric source supply circuit, which is characterized in that the wherein flyback type electric source supply
Circuit includes：One transformer has first side winding, to receive an input voltage；Secondary side winding, to generate the first output electricity
Pressure；And a tertiary winding, to generate the second output voltage；One secondary side control circuit is located at the secondary side of the transformer, with
One third output voltage is power supply, to control a coupling element according to first output voltage, and in the one of the transformer
Secondary side generates a feedback compensation signal, and the wherein third output voltage is relevant to first output voltage；One power switch, coupling
In the first side winding；And a primary side control circuit, it is located at the primary side of the transformer, is electricity with second output voltage
Source, to generate a switch control signal to control the power switch, wherein the coupling element is coupled to primary side control electricity
Between road and the secondary side control circuit；The method includes the steps of：
In Yu Yicong news patterns, when second output voltage is less than a first voltage threshold value, triggering enters a power supply and adjusts mould
Formula, to control the power switch so that second output voltage is between the first voltage threshold value and a second voltage threshold value；
In entering the power supply shaping modes after the delay periods of an acquiescence, stop the power supply shaping modes so that the primary side
Control circuit enters a reset routine；And
Wherein in the reset routine, it is to be not turned on to control the power switch so that the third output voltage is less than a secondary side
Restart threshold value thus restarts the secondary side control circuit.
16. the method according to claim 15 for controlling a flyback type electric source supply circuit, wherein also include following
Step：In the reset routine, it is to be not turned on to control the power switch so that second output voltage once stresses to open less than one
Threshold value thus restarts the primary side control circuit.
17. the method according to claim 15 for controlling a flyback type electric source supply circuit, wherein also include following
Step：The Cong Xun patterns are determined according to the feedback compensation signal and a tertiary voltage threshold value.
18. the method according to claim 15 for controlling a flyback type electric source supply circuit, wherein triggering enters one
The step of power supply shaping modes further includes：In a protected mode, the coupling element is controlled to adjust the feedback compensation signal extremely
One compliance voltage level so that it is to be not turned on, and then make the primary side control circuit that the switch control signal, which controls the power switch,
Triggering enters the power supply shaping modes, and enters the reset routine in turn.
19. the method according to claim 15 for controlling a flyback type electric source supply circuit, wherein also include following
Step：In a protected mode, which is discharged so that the third output voltage restarts threshold less than the secondary side
Value.
20. the method according to claim 15 for controlling a flyback type electric source supply circuit, wherein first output
Voltage is a variable value.
21. the method according to claim 20 for controlling a flyback type electric source supply circuit, wherein first output
The level of voltage is determined according to an adjustment signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762502740P | 2017-05-07 | 2017-05-07 | |
| US62/502,740 | 2017-05-07 |
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| TW (1) | TWI638509B (en) |
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| CN113708632B (en) * | 2021-03-16 | 2023-06-06 | 广州金升阳科技有限公司 | Flyback converter control method and control device thereof |
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| KR100379057B1 (en) * | 1999-04-10 | 2003-04-08 | 페어차일드코리아반도체 주식회사 | A Burst Mode Switching Mode Power Supply |
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| US20130003421A1 (en) * | 2011-01-12 | 2013-01-03 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for adjusting current consumption of control chips to reduce standby power consumption of power converters |
| CN105680694A (en) * | 2014-04-01 | 2016-06-15 | 英飞凌科技奥地利有限公司 | System and method for a switched-mode power supply |
| CN105207485A (en) * | 2014-06-19 | 2015-12-30 | 立锜科技股份有限公司 | Flyback Power Supply Circuit With Programmable Function And Control Method Thereof |
| CN106130349A (en) * | 2015-05-06 | 2016-11-16 | 立锜科技股份有限公司 | Flyback type electric source supply device and controller thereof and driver |
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| Publication number | Publication date |
|---|---|
| CN108809099B (en) | 2020-06-05 |
| TWI638509B (en) | 2018-10-11 |
| TW201843919A (en) | 2018-12-16 |
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